PHOENIX -- Investigators are trying to determine what sparked a house fire that spread to two neighboring homes Monday night.
It happened at about 10:30 p.m. in the neighborhood northeast of 24th Street and South Mountain Avenue, which is south of Baseline Road.
Firefighters believe the fire started in the attic of the home. The intense flames moved so fast they spread to houses on either side. Because of that, the call was escalated to a first-alarm assignment, which means additional crews were sent out.
The elderly woman who lived in the home where the fire started was staying with a relative at the time.
No injuries were reported, but the damage to all three houses is extensive and several people have been displaced.